4-Amino-3-hydroxy-1-naphthalenesulfonic acid from Canada
This specifically named aminohydroxynaphthalenesulfonic acid under HTS 2922.21.1000 serves as a building block for direct dyes and metal complex dyes. Contains required amino, hydroxy, and sulfonic functions on naphthalene core. Technical grade 90%+ purity standard.
Duty Rate — Canada → United States
15.8%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Position-specific isomer verification via LC-MS essential
• Biuret test confirms absence of urea impurities from synthesis
• Customs lab testing common for novel naphthalenedisulfonic isomers